I'm having this exact same issue but it don't matter what I do when I exit a world and reload it after the world reverts back to how it was at creation. I thought it was mods and tried w/without them with forge still active the same thing happens, if I load the world in vanilla minecraft first and load it back up in vanilla minecraft it's fine but as soon as I load it in forge minecraft and save and quit, the next time the worlds loaded its back to how it looked after first load. Also side note im running it on a local host server and I can't update to the newest version because it keeps crashing the server I have forge version 32.0.66